Php/docs/mysqlnduhconnection.getfieldcount
MysqlndUhConnection::getFieldCount
(PECL mysqlnd-uh >= 1.0.0-alpha)
MysqlndUhConnection::getFieldCount — Returns the number of columns for the most recent query
说明
public MysqlndUhConnection::getFieldCount
( mysqlnd_connection $connection
) : int
Returns the number of columns for the most recent query.
参数
connection- Mysqlnd connection handle. Do not modify!
返回值
Number of columns.
范例
MysqlndUhConnection::getFieldCount() is not only executed after the invocation of a user space API call which maps directly to it but also called internally.
Example #1 MysqlndUhConnection::getFieldCount() example
<?phpclass proxy extends MysqlndUhConnection { public function getFieldCount($res) { printf("%s(%s)\n", __METHOD__, var_export(func_get_args(), true)); $ret = parent::getFieldCount($res); printf("%s returns %s\n", __METHOD__, var_export($ret, true)); return $ret; }}mysqlnd_uh_set_connection_proxy(new proxy());$mysqli = new mysqli("localhost", "root", "", "test");$mysqli->query("WILL_I_EVER_LEARN_SQL?");var_dump($mysqli->field_count);$mysqli->query("SELECT 1, 2, 3 FROM DUAL");var_dump($mysqli->field_count);?>
以上例程会输出：
proxy::getFieldCount(array ( 0 => NULL, )) proxy::getFieldCount returns 0 int(0) proxy::getFieldCount(array ( 0 => NULL, )) proxy::getFieldCount returns 3 proxy::getFieldCount(array ( 0 => NULL, )) proxy::getFieldCount returns 3 int(3)
参见
- mysqlnd_uh_set_connection_proxy() - Installs a proxy for mysqlnd connections
- mysqli_field_count() - Returns the number of columns for the most recent query
